<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <% if(cur == 'true'){ %>
        <button>退出</button>
    <%} else { %>
        <button>登录</button>
    <% }%>
</body>
</html>